Welcome to the Growery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

10. Does your PPM/EC show a rise or fall when you do your daily PPM check?- has remained stable(maybe +/- 10ppm)

11. Does your pH show a rise or fall when you do your daily check?-tends to rise about 2 points over a week.

12. Do you foliar feed or spray your plants with anything?-No

13. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights")-1000w MH for veg, 1000w HPS for flower, currently HPS

14. How close are your lights to the plants?-20 inches

15. What size is your grow space in square feet?-4.5x9x7 tent

16. What is the temperature and humidity in your grow space?-ambient 25c, under light 27.5c

17. Have you noticed any insect activity in your grow space?-No

18. How much experience do you have growing?approx 20yrs on and off.

I am having a small leaf issue, Some white tips, which i have found common when using the tap water here. More importantly is the dark spots/necrosis? on the leaf tips. After doing some searching i've come up with 2 possible problems, Magnesium and zinc. But i need help narrowing it down and what to treat it with. Any help would be great. Heres some pics of the dark spots...

I never take too much stalk into water analysis's because it changes from year to year. Water sourced municipally is usually has high levels of chlorine in it that are toxic to cannabis plants. Excess chlorine in the water source causes all kinds of nasty symptoms to occur. Water sourced municipally usually needs to have the excess chlorine volatized out into the atmosphere before providing it to your plants.

There are a few ways to volatilize chlorine out of municipally sourced water. 1 is to fill a reservoir of sorts with the municipal water and oxygenate the water with a bubble stone(s) or water pump for 24 hours. The other method is a little more primitive. You just simply fill up a reservoir with the water, let it sit for 24 hours stirring it several times within that 24 hours.

From here it appears that you are in the early to middle stages of a Zinc (Zn) deficiency. Zinc is the most common micro-nutrient found deficient in cannabis. The way I can tell is by the younger leaves showing signs of chlorosis between the veins, and the tips of the new leaves are thin, small blades that are contorting and wrinkling. The plants are getting worse evidenced by the leaf tips turning brown and curling up as well as the the new leaf growth bending horizontally.

Zinc works with manganese and magnesium to promote similar protein actions. Zinc deficiencies are often misdiagnosed as either manganese or iron deficiencies. With zinc though (especially in the progressing stages) new leave blades twist and dry out. Same type of shit will happen to your buds too if the plant was suffering a zinc deficiency in the flowering stage. I'd treat by running a diluted mix of a complete and well balanced hydroponic fertilizer through the system that had chelated trace elements such as zinc, manganese, and iron.

Quote:hamloaf said:I never take too much stalk into water analysis's because it changes from year to year. Water sourced municipally is usually has high levels of chlorine in it that are toxic to cannabis plants. Excess chlorine in the water source causes all kinds of nasty symptoms to occur. Water sourced municipally usually needs to have the excess chlorine volatized out into the atmosphere before providing it to your plants.

There are a few ways to volatilize chlorine out of municipally sourced water. 1 is to fill a reservoir of sorts with the municipal water and oxygenate the water with a bubble stone(s) or water pump for 24 hours. The other method is a little more primitive. You just simply fill up a reservoir with the water, let it sit for 24 hours stirring it several times within that 24 hours.

From here it appears that you are in the early to middle stages of a Zinc (Zn) deficiency. Zinc is the most common micro-nutrient found deficient in cannabis. The way I can tell is by the younger leaves showing signs of chlorosis between the veins, and the tips of the new leaves are thin, small blades that are contorting and wrinkling. The plants are getting worse evidenced by the leaf tips turning brown and curling up as well as the the new leaf growth bending horizontally.

Zinc works with manganese and magnesium to promote similar protein actions. Zinc deficiencies are often misdiagnosed as either manganese or iron deficiencies. With zinc though (especially in the progressing stages) new leave blades twist and dry out. Same type of shit will happen to your buds too if the plant was suffering a zinc deficiency in the flowering stage. I'd treat by running a diluted mix of a complete and well balanced hydroponic fertilizer through the system that had chelated trace elements such as zinc, manganese, and iron.

thanks for the advice, I flushed out the system and refilled with 50% strength nutes. Hopefully it will help.